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以环三亚甲基三硝胺(RDX)为主体炸药,聚甲基丙烯酸甲酯(PMMA)为粘接剂,采用超声辅助一步造粒技术制备了RDX/PMMA微球。利用分子动力学(MD)模拟,对PMMA可作为RDX包覆材料的可行性进行了分析,并用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、傅里叶变换近红外(FT-IR)和差示扫描量热仪(DSC)对粒子进行性能表征,通过撞击感度对微球的安全性能进行测试。通过模拟,结合能ERDX&PMMA(610.69 k J/mol)>ERDX&F2602(499.93 k J/mol),即PMMA与RDX分子间作用力较强,相容性更好,可作为包覆RDX的粘接剂,与实验结果一致;XRD和FT-IR分析显示RDX/PMMA晶型结构没有发生转变;由DSC分析,与原料RDX相比,RDX/PMMA微球的热爆炸临界温度由220.95℃增加到227.53℃,热稳定性有所改善;RDX/PMMA微球特性落高从22.4 cm上升到了38.6 cm,安全性能明显提高;该方法将普通包覆的工作时间缩短了2.5倍,工作效率明显改善。
RDX / PMMA microspheres were prepared by ring-assisted trinuclear trinitamine (RDX) as the main explosive and polymethylmethacrylate (PMMA) as the binder by ultrasonic assisted one-step granulation. The feasibility of using PMMA as RDX coating material was analyzed by molecular dynamics (MD) simulation. The properties of PMMA coating were analyzed by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform near infrared ) And differential scanning calorimetry (DSC) were used to characterize the particles. The safety of the microspheres was tested by impact sensitivity. Through the simulation, the binding energies of ERDX & PMMA (610.69 kJ / mol)> ERDX & F2602 (499.93 kJ / mol) Compared with the raw material RDX, the critical temperature of thermal explosion of RDX / PMMA microspheres increased from 220.95 ℃ to 227.53 ℃, which was in good agreement with the experimental results. The XRD and FT-IR analysis showed that the crystal structure of RDX / PMMA did not change. The thermal stability of RDX / PMMA microspheres increased from 22.4 cm to 38.6 cm, which markedly improved the safety performance. This method shortened the work time of conventional coating by 2.5 times and significantly improved the work efficiency.